The pH 4502c, manufactured by DIY MORE (Part ID: PH BOARD), is a pH sensor module designed for measuring the acidity or alkalinity of a solution. It provides accurate and reliable pH readings, making it ideal for a wide range of applications. This module is commonly used in laboratory experiments, aquariums, hydroponics, water quality monitoring, and industrial chemical processes.
The pH 4502c module is easy to integrate into microcontroller-based systems, such as Arduino, and features an onboard potentiometer for calibration. Its compact design and high sensitivity make it a popular choice for both hobbyists and professionals.
This circuit interfaces a pH sensor module (ph4502c) with an Arduino UNO. The pH sensor is powered by the Arduino's 5V and GND pins, and its analog output (Po) is connected to the Arduino's A0 pin for pH level readings.
Open Project in Cirkit Designer
This circuit features an Arduino UNO microcontroller interfaced with a MAX6675 thermocouple module, a ph4502c sensor module, an Adafruit DS1307 real-time clock (RTC) module, and an I2C LCD 16x2 display. The Arduino reads temperature data from the MAX6675, pH and temperature from the ph4502c, and time from the RTC, displaying this information on the LCD. A pushbutton is connected to the Arduino for potential user input, and all modules are powered by the Arduino's 5V output.
Open Project in Cirkit Designer
This circuit features an Arduino 101 microcontroller connected to various sensors and an LCD display. The Arduino collects data from a temperature sensor and a TDS (Total Dissolved Solids) sensor, and it controls a pH sensor module (ph4502c). The collected data is likely displayed on the 16x2 LCD screen, which communicates with the Arduino via I2C. A buck converter steps down the voltage from a 12V power supply to power the Arduino and the sensors.
Open Project in Cirkit Designer
This circuit is designed to measure pH and TDS (Total Dissolved Solids) levels in a solution using a pH sensor and a TDS sensor, respectively, interfaced with an Arduino Leonardo. The measured data is then displayed on a 0.96" OLED screen.
Open Project in Cirkit DesignerBelow are the key technical details of the pH 4502c module:
The pH 4502c module has a 4-pin interface for connecting to a microcontroller or other devices. The pin configuration is as follows:
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | Power supply input (5V DC). |
| 2 | GND | Ground connection. |
| 3 | DO | Digital output (high/low signal, typically unused for pH measurement). |
| 4 | AO | Analog output (provides a voltage proportional to the pH value). |
VCC pin to a 5V power source and the GND pin to ground.AO pin to an analog input pin on your microcontroller (e.g., Arduino).DO pin can be connected to a digital input pin, but it is typically not used for pH measurement.Below is an example of how to use the pH 4502c module with an Arduino UNO:
// pH 4502c Example Code for Arduino UNO
// This code reads the analog output from the pH sensor and converts it to a pH value.
const int pH_pin = A0; // Analog pin connected to the AO pin of the pH 4502c module
float voltage; // Variable to store the sensor's output voltage
float pH_value; // Variable to store the calculated pH value
void setup() {
Serial.begin(9600); // Initialize serial communication at 9600 baud
pinMode(pH_pin, INPUT); // Set the pH pin as an input
}
void loop() {
// Read the analog value from the pH sensor
int sensorValue = analogRead(pH_pin);
// Convert the analog value to voltage (assuming 5V reference voltage)
voltage = sensorValue * (5.0 / 1023.0);
// Convert the voltage to a pH value
// The formula below assumes a linear relationship between voltage and pH
// Adjust the coefficients based on your calibration results
pH_value = 3.5 * voltage + 0.0; // Example formula, adjust as needed
// Print the pH value to the Serial Monitor
Serial.print("pH Value: ");
Serial.println(pH_value);
delay(1000); // Wait for 1 second before the next reading
}
Inaccurate Readings:
No Output Signal:
Fluctuating Readings:
Q: Can I use the pH 4502c with a 3.3V microcontroller?
A: The module requires a 5V power supply, but the analog output can be read by a 3.3V microcontroller. Use a level shifter if needed.
Q: How often should I calibrate the sensor?
A: For best results, calibrate the sensor before each use or at least once a week during regular operation.
Q: Can the pH 4502c measure highly acidic or basic solutions?
A: Yes, the module can measure pH values from 0 to 14. However, prolonged exposure to extreme pH levels may reduce the probe's lifespan.
Q: What is the lifespan of the pH probe?
A: The lifespan of the probe depends on usage and maintenance. With proper care, it can last 1 to 2 years.